Thank you for sharing this! It’s a very interesting and well thought-out take on his character [x].
What we know for sure is that it’s in reference to his prickly personality.
I think the hedgehog allegory in Switzerland the hedgehog country is in reference to the greek fable about the fox and the hedgehog, how the fox knows many ways to do something while the hedgehog knows only one, but both are equally successful. The reference is made because Switzerland is unwilling to change his isolationist ways even while the world is progressing towards more international cooperation rather than because of his prickly personality, though it could have a double meaning.
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Ellawritesficssometimes 